When you are on a horse on and someone teleports you ( /tp ) you teleport without the horse.
Comments 4
Is this still a concern in the current Minecraft version? If so, please update the affected versions in order to best aid Mojang ensuring bugs are still valid in the latest releases/pre-releases.
"The command is teleporting you, not the entity you're riding. So you will also teleport without your minecart and without your boat. I'd say works as intended"
Comparing minecarts and boats to horses is unfair: Minecarts and boats can be easily replaced by crafting. Nothing distinguishes one boat or minecart from another. On the other hand, horses must be found, given a saddle, and can be given armour and a name. None of these things are craftable. In other words, a lot of effort goes into a horse and its accessories.
Without horse teleportation, a player is effectively limited to using that horse on a single continent and having to find a new horse on any other continent they want to ride on.
The command is teleporting you, not the entity you're riding. So you will also teleport without your minecart and without your boat. I'd say works as intended.